I don't know how I got this idea, but I like it so I decided I'd share.

For the low, low cost of 2 of every plort in the game (before this point and including gold), 3 strange diamonds, 2 lava dust, and 30 jellystone, you get the plortrifuge.

The plortrifuge is the first step in slime genetics research. With it, you can combine slime plorts (3 of different varieties) with 15 of a new item, the organic molecule, which you get by feeding slimes into the centrifuge (breaks down the slime into 15 organic molecules). This way you can create new slimes. I'll take suggestions for combinations of 3 plorts to make new slimes, but here's some I thought up and found around the community.

The obsidian slime behaves and looks like a fire or puddle slime (but black / purple and with a rocky texture and rounded spikes at the top), an can be kept in either an ash tray or a lake. It's special ability is its sturdiness. It can't be pushed around by ranchers or other slimes, and Its plorts can be used in future slime science to make stronger and / or boom-resistant cage walls and air nets.